Grinding-machine.



No. 643,928. l Patented Feb. 20, |900. W.l WLKERG. A. H. GRIMM.

v GRINDING MACHINE.

. (Application led Deo. 1, 1899.) (No Model.)

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. the arm 8 of the eccentric-ring.

UNITED STATES PATENT OPrien.-

VILLIAM I. WALKER AND ASMUS I'I. GRIMM, OF ROCK ISLAND, ILLINOIS.

GRlNDlNG-NIACHINE.

SPECIFICATION forming part of Letters Patent No. 643,928, dated February 20, 1900.

Application filed December 1, 1899. Serial No. 738,832. (No model.)

To @ZZ whom t may concern:

Beit known that we, WILLIAM I. WALKER and ASMUS l-I. GRIMM, of the city of Rock Island, county of Rock Island, and State of Illinois, have invented certain new and useful Improvements in Giinding-Ifachines, of which the following is a specification.

This invention relates t0 machinesin which the grinding-wheel is swung reciprocatingly against its work, as in grinding sickles of harvesters, and it provides simplified and superior means for imparting the swinging motion to the grinding-wheel.

The invention is exemplified in the structure hereinafter describedV and it is defined in the appended claims.

In the drawings forming part of this speciiication, Figure 1 is a side elevation of a grinding-machine embodying our improvements. Fig. 2 is aplan of the machine. Fig. 3 is a detail in side elevation of the mechanical elements used to convert the rotary motion of the shaft of the machine into reciprocating motion and to transmit the converted motion to the swinging end of the frame of the grinding-wheel.

A base-plate 1 has a forked standard 2, in the upper end of which the shaft 3 is journaled. A gear-wheel 4 is xed on a projecting end of shaft 3 and provided with a handle. A frame 13 is pivoted at one end on shaft 3, and the other end carries the shaft 14 of thegrinding-wheel 15. The pivoted end of the grinding-frame 13 is forked to leave a part of shaft 3 unoccupied, and an eccentric 6 is fixed on the shaft between the members of the forked pivoted endof the grinding-frame. A ring 7 encircles the eccentric, which is composed of two parts fastened together, and an arm 8 extends downward from the ring of the eccentric. A lever 9 is pivoted at 10 in the crotch of the forked standard, and one of its ends connects pivotally with A rod 11 connects pivotally with the opposite end of lever 9 and extends to the under surface of the grinding frame. The grinding-frame has a vertical slot 13, extending at right angies with shaft 3, and a slide-block 12 is attached to the frame by means of a bolt 12 and is connected pivotally with the upper end of rod 11. The shaft 14 of the grinding-wheel has a pinion 16, which meshes with wheel 4, and when the wheel 4 is turned the grindingwheel is rotated through the pinion and moved up and down by the eccentric acting through the arm, the lever, and the rod. To vary the swing of the grinding-frame,the slideblock 12 may be shifted nearer to or farther from the shaft 3, and when it is desired to rotate the grinding-wheel without oscillating it either the wheel 4 or the eccentric may be loosened on shaft 3, so as to make the swinging mechanism inoperative. In this case a removable pin 4 is provided for the wheel and a pin 6a for the eccentric; but other means may be employed to fasten the wheel or the eccentric detachably on the shaft. A strap 2l is pivotally connected at one end with the swing'able frame 13, and ih the other end it has a slot that engages a bolt 22 on a side of standard 2. A wing-nut 23 screws onto the bolt outside the strap and provides means for holding the frame 13 firmly in any desired position. So long as the oscillating movement of the grinding-wheel is required the slotted end of the strap is permitted to p lay freely up and down on the bolt; but whenever it is desired to hold the grinding-wheel against oscillation the drive-wheel is disconnected from the cam and the strap 21 is clamped firmly by the set-nut or set-screw.

The machine is particularly designed to grind sickles for harvesting-machines, and a clamp-frame 17, having relatively-stationary clamp-bearings 18 and 19 and a shiftable clam p-handle 20,is provided to hold the sicklebars while they are ground. In this case the shiftable clamp member consists of a screw set in'a lug on the clamp-frame to bear against the sickle when it is properly adjusted; but the character of the clamp is not material.

The grinding-wheel is shaped to conform to the space between two sickle-sections and act on opposed surfaces of the sections. The lever will rock the grinding-wheel up and down so long as the eccentric receives motion from the drive-wheel 4, and when the eccentric is disconnected the grinding-wheel may be held in any desired position by tightening the thumb-screw that holds the brace or strap running from the grinding-frame to the forked support or standard.

The eccentric is the preferred mechanical IOO element for converting the continuous rotary `motion of the shaft 3 into the reciprocating motion in arm 8; but it is obvious that a double crank would be the full mechanical equivalent of the eccentric.

We claiml. In a grinding-machine, the combination of a drive-shaft, a gear-wheel fixed on the drive-shaft, a frame pivoted on vthe driveshaft and carrying a grinding-wheel in its swinging end, a pinion on the shaft of the grinding-wheel in mesh with the drive-wheel, an eccentric fixed on the drive-Shaft, a lever fulcrumed between its ends and connected at one end with the eccentric and a connection between the opposite end of the lever and the grinding-frame, substantially as described.

2. In a grinding-machine, the combination with a drive-shaft and a grinding-frame pivoted on the shaft, of an eccentric fixed on the drive-shaft, a lever fulcrumed between its ends, a connection between one end of the 1ever and the eccentric and a connection between the otherend of the lever and the swingable grinding -frame, substantially as described.

3. In a grinding-machine, the combination with a drive-shaft and a grinding-frame pivoted on the shaft, of an eccentric fixed on the drive-shaft, a lever pivoted between its ends, a bearing on the grinding-frame adjustable to and from the pivot thereof, a connection between the eccentric and one end of the lever and a connection between the other end of the lever and the adjust-able bearing of the swingable grinding-frame, substantially as set forth.

4t. In a grinding-machine, the combination of a base, a forked standard, a drive-shaft, a gear-wheel and an eccentric ixable on the shaft, a frame pivoted on the shaft, a grinding-wheel journalcd in the swingingend of the frame, a pinion on the shaft of th grinding-wheel in mesh with the gear-wheel of the drive-shaft, a lever pivoted in the standard and connected from one end with the eccentric and from the other end with the swingable frame, a slotted strap connected pivotally with the swingable frame and a clampbolt on the standard engaging the slot of the strap7 substantially as described.

In testimony whereof we sign our names in the presence ot` two subscribing witnesses.

WILLIAM I. WALKER. ASMUS II. GRIMM. Witnesses: A. R. LELAND,

OTTO BRONENKANT. 

